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J. W. PORTER. AUTOMATIG INDIGATING GALIPEM.

N0, 486,810. Patented NOV. 2v2, 1892.

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WITNESSES i llNrrnD STATES ATENT FFICEQ I JOHN W. PORTER, OF WAUKESHA, VISOONSIN, ASSIGNOR OF ONE-HALF TO JAMES MCNAUGHTON, OF SAME PLACE.

AUTOMATIC lNDlCATlNG-CALIPERS.

SPECIFICATION forming part of Letters Patent N o. 486,810, dated November 22, 1892. i

Application filed August l5, 1892. Serial No. 443,094. (No model.)

To all whom it may concern..- merals for inch spaces advance by twos in Be it known that I, JOHN W. PORTER, of order to give direct readings for diameters. Waukesha, in the county of Waukesha and An index-plate N, having an opening in line State of Wisconsin, have invented a certain centrally with the series of numerals on the 5 new and useful Improvement in Automatic bar B, is fixed to the head A, the nume-ral Indicating-Oalipers, of which improvement which in any position of the bar is visible the following is a specification. through the opening of the index-plate being My invention relates to measuring applithat used in the corresponding registration. ances for use in connection with lathes for The lower end of the radius-barB is of hol- 6o ro turning or boring car and locomotive wheels, low or-tubular form and is fitted to receive pulleys, rolls, and other descriptions of Work; and guide a supplemental or indicator bar O, and its object is to provide a simple and efwhich slides freely longitudinally within it. fective instrument for automatically indicat- A rackD is connected to one side of the indiing variations from desired and determined Gator-bar O and projects outwardly from the 15 dimensions of finish in the work and enabling tubular portion of the bar B through a slot uniformity and accuracy to be attained iu E formed therein. An indicating-gage F is the finished pieces. fixed to the bar B near its lower end, the pri- To this end my invention consists in cermary or main index or pointer G of the gage tain devices and .combinaticns hereinafter being actuated through a train of intermedi- 7o zc fully set forth. ate gearing G G2G3 by the rack D in the ver- In the accompanying drawings, Figure 1 is tical movements of the latter with the cona front view, in elevation, of an automatic innected indicator-bar O. Vertical adjustment dicating-caliper, illustrating an application of the gage F on the barB is provided for of my invention; Fig. 2, a side view, in elevaby slotted holes in the side brackets O,through 25 tion, of the same; Fig. 3, a transverse section which the gage is attached to the bar. at the line :z: of Fig. l; and Fig. et a front Downward movement of the bar C and rack view, in elevation and on a larger scale, of the D in accordance with reduction of radius of indicating-gage. the work causes the index G to move forward In the practice of my invention I provide a over the dial of the gage F in a direction v8o 3o rectangular head or frame A, havingalateral as with thehands of a clock, this movement arm A', by which it is supported in a lathe, being in a direction from the numeral 2 topreferably by standards fixed to the latheward the 0 of the inner series of graduahead, so as to provide for lateral adjustment.. tions of the dial, and upward movement of A radius bar B is fitted to slide vertically in the bar and rack in accordance with increase 3 5 the headA, said barhavingaseries of notches of radius of the work effects a reverse moveor recesses a, formed at determined disment of the index G, as against the hands of tances--as, say, one inch apart-on one of its a clock, or in a direction from 0 toward sides. The bar B is supported and locked in the numeral 2. vertical adjustment by a latch M, sliding in The dial of the gage F is composed of two oo 4o a guide in the head Atransversely to the line independent and concentric sections H I, the

of traverse of the bar B and havingits inner inner section I being fixed and the outer end adapted to engage either of the series of i H free to move about it. The inner secnotches, the latch M being engaged with and tion I, which to facilitate registration may disengaged from the notches a by a thumbbel marked with the words Additional Di- 45 lever M', pivoted to the head. The bar B is ameter, is graduated in fractional parts of adjustable to approximate different radii of an inch from two inches to zero, reading the work, and the lines of the contact-faces from right to left. The outer section I-I is of it-snotches a, which are preferably spaced graduated in thirty seconds of an inch in one inch apart, are marked and numbered on the same direction as the numerals on the roo 5o the front face of the bar, as shown by the nudial of a clock, these graduations correspondmerals 26 32 34,&c., Fig. l. These nuing accurately with the degree of movement of the indicator-bar C. The limit of move ment of theindex G is indicated by atelltalepointer .T, mounted upon the gage concentric with the dial-sections and having a shoulder or projection j, against which the primary index is adapted to bear in its traverse forward. The outer dial-section maybe marked, Vas shown, with the words Depth of Flat Spots or Cuts.

The lower end of the indicator-bar C bears on the periphery of the work through a steel traveler-wheel L, journaled on roller-bearings in the lower end of the bar, so that the bar C coincides radially with the work, and the graduations on the dial-section I,when added to the readings at the index-plate N,indicate the full diameter of the work. The downward movement of the bar C is limited within proper range by a stop-pin K, and it is held in position by a small catch when raised to bring the index G to the numeral 2 of the inner dial-section I, which is its `normal position before adjusting the radins-bar B to the` work.

In the operation of the device as applied, for example, to a car-wheel lathe, it is suitably supported therein, and the car-wheels,

having been set in proper position, the radiusbar B, through the latch M, is adjusted to the notch which will admit of the closest proximity of the traveler-wheel L to the work without actual contact therewith. Assuiningthat in this position the figures 2S are visible.

through the opening ofthe index-plateN, this indication, together with the two inches ad ditional diameter, as indicated on the dial-section I by the index G, would represent the total diameter of the work as being forty inchesvifrthe traveler L were in contact with it.

until the traveler comes in contact with .the work. In this movement the index Gr has moved from its normal position to, say, the4 eller L follows the contour of the Wheel-tread,.

any irregularities in which-such as flat or high spots-will cause vertical movement of the indicator-bar C, upward movement cansing the index G to turn backward carrying with it the dial-section H, and downward, movementcausingtheindexGtoturnforward carrying with'it the telltale-index J. At the completion of a revolution of the work the dis-v tance between the telltale-index J and the O on the inner dial I will, when added to the indiytially as above The catch sustaining the indicator-barv C is then released, when the bar C descends.

cation at the index-plate N o the head A, represent the minimum diameter to which the work will finish when trued in diameter. Any high spoton the periphery ofthe work will raise the indioator-bar C! and rack D, causing the index G to move the O of the dial H from the telltale-index J. The distance between the telltale-index J and the O7 of the dial H, read by the graduations on said dial, is therefore the maximum variation in the radius of the work. The distance between the O of the outer dial H and the 0 of the inner dial I, read from the graduations on the latter dial,will, when added to the indication at the index-plate N, give the maximum diameter of the work. The position of the parts, as shown in the drawings, indicates that at the commencement of the turning of the wheel-tread the maximum diameter of the latter was thirty-nine inches, that it will be thirty-eight ve-sixteenths inches in diameter v when trued up, that one-fourth of an inch hasr already been taken off, that three thirty-seconds of an inch have yet to be taken off, and

. that the variation in radius was eleven thirtyseconds of an inch and in diameter eleven. y

sixteenths of an inch.

By the employment of the caliper, substan*l described, on each wheel of a a matter of a single revolupair, it is merely tion of the wheels to ascertain which of the two is the smaller and the degree of varia- `tion between the diameters of the respective wheels. The operation of turning can be contued without interruption until both wheels IOO are finished with absolute accuracy and equal-E ity. In the case of locomotive driving wheelsthe actual diameter is obtained and uniformvity in the Wheels of a pair and-.betweena series of pairs insured in a simple, ready, and i effective manner.

My improvement, which is of inexpensive construction and adaptable to use in connection with lathes of any of the ordinary. patterns, constitutes a useful and economical `adjunct in their operation by enabling the workfI man to be correctly informed of the condition yof his Work in all of its stages andby affordf ing asafeguard against they loss due to the frequent. and serious errors .which occur in the employment of cheap labor on wheel-VV lathes when unaidedby means for theautomatic and accurate obtention and registratially and as. it proceeds.

tion;of measurements Vof the work both ini.

I claim as myinvention and desirevtosecure by Letters Patent l. The combination, in an indicating-calin per, of a radius-bar which is adjustable in position relatively to a fixed support to indicate approximately the diameter of a piece of work, an indicator-bar adapted to bear on the periphery of thework and to traverse freely longitudinally on the radius-bar, a fixed dial,

a primary index actuated by the indicator-bar to indicate the complement of the. diameter kon said dial, and a movable dial and telltaleindex, each adjustable relatively to the primary index, for automatically indicating variations from the initially-ascertained diameter of the Work, substantially as set forth.

2. The combination, in an indicating-caliper, of a supporting head or frame, a radiusbar fitting adjustably therein, an indicatorbar sliding freely in the radius-bar, an indicating-dial iixed to the radius-bar, a primary index traversing around said dial and actuated by movements of the indicator-bar, and a movable dial and telltale-index, each adj ustable relatively to the primary index, substantially as set forth.

3. The combination, in an indicating-caliper, of a supporting head or frame, a radius bar fitting adjustably therein, an indicatorbar sliding freely in the radius-bar, an indicating-dial fixed upon the radius-bar, a primary index traversing around said dial and actuated by movements of the indicator-bar, a movable dial mounted upon and concentric with the fixed dial and carrying a pin or abutment against which the primary index bears in its traverse in one direction,and a telltaleindex mounted concentric with the fixed and movable dials and carrying a shoulder or projection against which the primary index bears in its traverse in the opposite direction, substantially as set forth.

4. The combination, in a registerin g-cali per, of a supporting head or frame, a radius-bar having a series of lateral notches or recesses spaced at regular intervals and provided with numeral indications, said bar being fitted to traverse longitudinally in the head, an adjusting-latch adapted to engage either of the notches of the radius-bar and hold the latter mounted concentric with the fixed dial and movable thereon independently of the movable dial, substantially as set forth.

5. The combination, in an indicating-caliper, of a supporting head or frame, a radiusbar tting adj ustably therein, an indicatorbar sliding freely in the radius-bar and carryingfa lateral rack exterior thereto, an indicating-dial fixed to the radius-bar, a primary index mounted on said dial, intermediate gearing transmitting motion from the rack of the indicator-bar to the primary index, and a movable dial and telltale-index, each adjustable relatively to the primary index, substantially as set forth.

6. The combination, in an indicating-caliper, of a radius-bar having a hollow or tubular end portion, an indicator-bar fitted to slide freely therein, an indicating-gage connected with the capacity of longitudinal adjustment to the tubular portion of the radius-bar, and a primary index mounted on said vgage and actuated bythe movements of the indicatorbar, substantially as set forth.

JN0. W. PORTER. 

